Cu(VO)(SeO3)2 (A) and (B) Forms: Synthesis and Crystal Structures of New Copper(II)–Vanadyl(IV) Diselenites

✍ Scribed by P. Millet; R. Enjalbert; J. Galy

• Book ID: 102609058
• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 460 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8278

✦ Synopsis

Two forms of copper(II) vanadyl(IV) diselenite CuVO(SeO 3 ) 2 have been synthesized by solid state reaction. The form (A) belongs to the monoclinic system space group P2 1 /c with a ‫؍‬ 7.983(1) A s , b ‫؍‬ 8.877(2) A s , c ‫؍‬ 8.437(2) A s , and ‫؍‬ 100.62(2)3. It is a layered structure built up of CuO 6 and VO 6 octahedra associated, respectively, by pairs via edge sharing which are making [Cu 2 O 10 ] and [V 2 O 10 ] dimers. These dimers are building a layer [CuVO 7 ] n upon which are 5xed the selenium (IV) cations. The lone pairs of the selenium (IV) are packed in a double layer perpendicular to the [001] direction. Form (B) crystallizes in the orthorhombic system, space group Pnma with a ‫؍‬ 7.071(2) A s , b ‫؍‬ 8.223(2) A s , and c ‫؍‬ 9.500(2) A s . The structure also exhibits dimers associated via edge and corner sharing along the [100] and [010] directions, which build up layers parallel to the (001) plane; they are held together by Se+O bonds. The connection via V+O+Cu induces a local order that does not respect the three-dimensional order of the network.